Energy out and Energy in of a system are 10 J and 25 J respectively, what is the efficiency of the system?
a) 10%
b) 40%
c) 50%
d) 80%
Explanation: Efficiency = 10/25*100 = 40%.
What is the efficiency of the system, if the actual work output from the process is 10 J and work output for a reversible process is 40 J?
a) 10%
b) 40%
c) 25%
d) 65%
Explanation: Efficiency = 10/40*100 = 25%.
What is the coefficient of performance of a system, if its work input is 50 J and heat removed is 35 J?
a) 35%
b) 50%
c) 70%
d) 95%
Explanation: Coefficient of performance = 35/50*100 = 70%.
The efficiency of electric fan is……….
a) 35%
b) 55%
c) 70%
d) 95%
Power:
The
quantity that tells us the rate of doing work is called……..
a) Efficiency
b) force
c) pressure
d) power
Explanation: The rate of doing work is called power
